With high-speed optical transceivers evolving quickly into smaller form factors with different requirements, test and measurement tools and procedures must keep pace. Lightwave Editorial Director Stephen Hardy met with Dr. Paul Brooks of JDSU’s Network and Services Enablement Group at ECOC 2013 recently to discuss the evolution from CFP to CFP2, what the test requirements of CFP4 might be, and what the future holds for transceivers designed to support eventual 400 Gigabit Ethernet specifications.